I have an ongoing problem with my ST70 (over a year). The car behaved fine up until this point (I've owned it for 6 years).

The problems and history -

Initial fault problems:

· stuttering /loss of power on medium – long cornering (e.g roundabouts)and when going uphill

· power loss at around 3000-3500 rpm. Increased application of accelerator at this point made this worse.

· problems worse with less fuel in tank but still occurred frequently

New coil pack 15/7/09. Failed to make any difference. Car broke down following this.

New pump and sender 17/7/09. Was better after the new pump but never has been 100% OK.

Continued problems:

· misfire / stuttering power loss at around 4500-5000 rpm.

· with full tank (& cold engine?) problem occasional. Once down to half tank or less – power loss frequent at 4500 rpm

New spark plugs, and fuel filter with service 13/5/10. –no change

New IMRC (inlet manifold runner control) 28/9/10 after engine management light came on and checked by Ford dealer. – no change

Other forum threads with similar problems ahve suggested MAF sensor - but this doesn't seem to have worked for those people.

Can anyone offer any ideas please. I'm at my wits end and just about ready to trade-in...